"I saw the Prophet - (a number of times) such that I was not able to count - using the Siwak while he was fasting."
Jami` at-Tirmidhi Book 8, Hadith 44
← Previous Hadith A man came and said: "O Messenger of Allah; I am ruined!" He said: "What has ruined you?" He said: "I had sexual relations with my wife during Ramadan." He said: "Are you able to free a slave?" He said, "No." He said: "Then are you able to fast for two consecutive months?" He said, "No." He said: "Then are you able to feed sixty needy people?" He said, "No." He said: "Sit." So he sat. A big basket full of dates was brought to the Prophet, and he said: "Give it in charity." So he said: "There is no one needier than us between its two mountains." So the Prophet laughing until his pre-molar teeth appeared, and he said: "Then take it to feed your family."

Jami` at-Tirmidhi Book 8, Hadith 43 Next Hadith → a man came to the Prophet and said: "My eyes are bothering me, can I use Kuhl while I am fasting?" He said: "Yes."

Jami` at-Tirmidhi Book 8, Hadith 45